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| author | Vineet Gupta <vgupta@synopsys.com> | 2015-12-11 15:01:23 +0100 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-12-12 11:34:12 +0100 |
| commit | c512c6ba7ac41b8bc196f17a85ee52099a109146 (patch) | |
| tree | fa24af29e592db31b906db48bbe7dfbcb07d7a73 /arch | |
| parent | ARCv2: perf: Ensure perf intr gets enabled on all cores (diff) | |
| download | linux-c512c6ba7ac41b8bc196f17a85ee52099a109146.tar.xz linux-c512c6ba7ac41b8bc196f17a85ee52099a109146.zip | |
ARC: intc: Document arc_request_percpu_irq() better
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/kernel/irq.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c index d736678d2724..b1f75937f0e1 100644 --- a/arch/arc/kernel/irq.c +++ b/arch/arc/kernel/irq.c @@ -51,6 +51,18 @@ void arch_do_IRQ(unsigned int irq, struct pt_regs *regs) set_irq_regs(old_regs); } +/* + * API called for requesting percpu interrupts - called by each CPU + * - For boot CPU, actually request the IRQ with genirq core + enables + * - For subsequent callers only enable called locally + * + * Relies on being called by boot cpu first (i.e. request called ahead) of + * any enable as expected by genirq. Hence Suitable only for TIMER, IPI + * which are guaranteed to be setup on boot core first. + * Late probed peripherals such as perf can't use this as there no guarantee + * of being called on boot CPU first. + */ + void arc_request_percpu_irq(int irq, int cpu, irqreturn_t (*isr)(int irq, void *dev), const char *irq_nm, |